Syringe plunger



FIG. 1 is a perspective view of a syringe plunger, showing my new design, the broken line showing of the barrel is for illustrative purposes only and forms no part of the claimed design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a syringe plunger, as shown and described. 